Seismic hazard depicts the levels of chosen ground motions that likely will,
or will not, be exceeded in specified exposure times. Hazard maps commonly specify a
10% chance of exceedance (90% chance of non-exceedance) of some ground motion
parameter for an exposure time of 50 years, corresponding to a return period of 475
years. Such maps depict Peak Ground Acceleration (PGA) with a 10% chance of
exceedance in 50 years for a firm soil condition. PGA, a short-period ground motion
parameter proportional to force, is the most commonly mapped ground motion
parameter because current building codes that include seismic provisions specify the
horizontal force a building should withstand during an earthquake.
Keywords: Abu Serga church, Architectural Heritage Preservation, Cairo,
Ground Motion, PGA, Survey.
